Granby, Colorado · field elev 8,207 ft
Density Altitude at Granby-Grand County (KGNB)
Granby-Grand County is a genuine high-and-hot field: from 8,207 ft of elevation, a typical July afternoon (75 °F) pushes density altitude to about 11,036 ft — the airplane performs like it is 2,829 ft above the field before the wheels roll.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 14.1 | 7,176 ft | 25.8 | 7,966 ft ▲ |
| February | 17.5 | 7,408 ft | 30.5 | 8,277 ft ⚠ |
| March | 26.6 | 8,020 ft | 39.8 | 8,881 ft ⚠ |
| April | 35.7 | 8,617 ft | 48.3 | 9,421 ft ⚠ |
| May | 45.4 | 9,238 ft | 59.4 | 10,110 ft ⚠ |
| June | 54.1 | 9,784 ft | 70.1 | 10,757 ft ⚠ |
| July | 59.4 | 10,110 ft | 74.8 | 11,036 ft ⚠ |
| August | 57.8 | 10,012 ft | 72.7 | 10,912 ft ⚠ |
| September | 51.3 | 9,609 ft | 66.9 | 10,565 ft ⚠ |
| October | 40.9 | 8,952 ft | 54.7 | 9,821 ft ⚠ |
| November | 28.7 | 8,159 ft | 39.5 | 8,862 ft ⚠ |
| December | 17.9 | 7,436 ft | 28.0 | 8,112 ft ⚠ |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for KGNB
DENSITY ALTITUDE high DA
Field elevation 8,207 ft — the air behaves like 11,048 ft.
- PRESSURE ALT
- 8,209 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Colorado fields
- 20V — Mc Elroy Airfield
Kremmling · elev 7,416 ft
- KBDU — Boulder Municipal
Boulder · elev 5,288 ft
- KLMO — Vance Brand
Longmont · elev 5,055 ft
- KBJC — Rocky Mountain Metro
Denver · elev 5,673 ft
- KEIK — Erie Municipal
Erie · elev 5,119 ft
- 33V — Walden-Jackson County
Walden · elev 8,154 ft
- KFNL — Northern Colorado Regional
Fort Collins/Loveland · elev 5,020 ft
- KSBS — Steamboat Springs/Bob Adams Field
Steamboat Springs · elev 6,882 ft
Frequently asked questions
How high does density altitude get at KGNB in summer?
On a typical July afternoon — around 75 °F at the nearest NOAA normals station — density altitude at Granby-Grand County reaches roughly 11,036 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at KGNB on an average day?
It swings with the seasons: from roughly 7,176 ft at the coldest month's average temperature to about 10,110 ft at the warmest month's — all from a constant field elevation of 8,207 ft. The month-by-month table above carries the full year.
What is the field elevation of Granby-Grand County?
8,207 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGNB (ICAO) / GNB (FAA), in Granby, Colorado.